Additional file 7.
a-c. Phylogenetic trees showing divergence of DHH(A), PTCH1(B), and PTCH2(C) in model organisms in which the genes have been completely sequenced. Mm = mouse, La = elephant, Me = tammar wallaby, Cf = dog, Tt = dolphin, Ss = pig, Gg = gorilla, Hs = human, Pp = Chimpanzee, Bt = cow, Dr = zebrafish, Tn = Tetraodon, Ol = Oryzias. Zebrafish is included in b and c as a known outlier.
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O'Hara et al. BMC Developmental Biology 2011 11:72 doi:10.1186/1471-213X-11-72